Melissa Buckley Every architect is going to give you a different price. Some will charge based on square footage, some based on the cost of construction, and some based on the number of hours it will take to complete the drawings. It will certainly take more than 15 hours to complete a permit set :). In addition, each firm will provide a different fee based on what they understand the scope of work to be. When you interview them, ask for a cost breakdown so that you can easily compare the different fees. Many people don't keep the architect involved on smaller projects during construction. I don't recommend this. The architect can be a great set of eyes to make sure you are getting what you expect from the contractor.
Start with www.aia.org. You can find firms in your area and they have a few articles which go through helping you understand the design process and what questions to ask when hiring the architect. Most important when making your decision, as with most everything, is communication. Choose one you feel listens, otherwise it's going to be a frustrating process. And as you do with contractors, interview and ask for proposals from at least three!
Regarding hiring a drafter. Your state may not allow this based on the size of the project and the occupancy. It's a great question to ask the building department. While there are ALWAYS exceptions to the rule, I've seen a number of projects that cost the developer more than it should have because the drafter did not understand the code and so the project either couldn't get a permit or construction was halted due to code violations. In addition, please know that the building department isn't held liable for any code violations discovered during construction even though they review the documents and issue the permits. So you want to make sure you hire someone that knows what they're doing!
Good luck!